java 和 php共享memcached数据注意有关问题
java 和 php共享memcached数据注意问题
在很多时候,一台memcached server中的数据,需要被不同语言的客户端访问。
在理想的情况下,一种语言写,其他语言读可能不会造成一些兼容的问题。
日前遇到了java和php共享数据的问题,php写入的时候,java可以读取;java写入的,php读取时候数据解析有误。
分析memcached中的数据:
telnet memcache-srv1 11211
get key[enter]
发现php写入,和java写入的数据存在一点差异。
php:VALUE key 1 250
java:VALUE key 0 250
大家发现了吧,就是一个状态位不一致导致。在java中,这个状态为用于压缩等其他标识,而在php中,用于作为判断php的对象(比如:array等)。
检查php代码,发现它是直接把array对象,传给php memcached 函数,由其进行序列化,以及加入标识,在读取的时候,其直接反馈相应的php对象。
set: $out = array(); $out['field1'] = "me"; $mc->set($key, $out, NULL, 12 * 3600); get: $out=$mc->get($key); echo $out['field1'];
解决方案:
使用传给php memcached客户端的时候,先序列化好。取的时候,在反序列化一次。
set: $out = array(); $out['field1'] = "me"; $mc->set($key, serilized($out), NULL, 12 * 3600); get: $out=$mc->get($key); echo unserilized($out)['field1'];
或者,修改java的memcacheClient源代码,不建议。

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